March 7

March 7 - Chapter 5 Thermo chemistry Absorption or release of heat that accompanies chemical reactions Energy Capacity to supply heat or to do work

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Chapter 5 Thermo chemistry - Absorption or release of heat that accompanies chemical reactions. Energy - Capacity to supply heat or to do work. - Energy = Heat + Work Kinetic Energy - Energy of motion - E (n) = ½(mass)(velocity)^2 Potential Energy - Stored energy “potential” to do work. Units of Energy - (kg)(m/s)^ 2 = (kg*m^2)/(s^2) = Joule - Small unit, so often in chemistry reaction we convert to KJ * Energy can not be created or destroyed. Energy can be converyed from one form to another. Calorie - Amount of energy necessary to house temp of 1 gram H2O By 1 Celsius. (1Cal = 4.184 J) Food Calorie (Kcal=Cal) Capital C Energy released when body uses the substance for food. Energy Changes - Energy cannot be created or destroyed - Change in E(Total) = 0 - E(Total) = E(Kinetic) + E(Potential) - In Chemistry Reaction, E “stored” as Potential E in bonds. Kinetic Energy - (E of motion) KE Thermal Energy - KE of molecular motion - “cold” – Low temp. – Molecules move slowly - “hot”
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This note was uploaded on 04/25/2008 for the course V 011 taught by Professor Staff during the Summer '06 term at NYU.

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March 7 - Chapter 5 Thermo chemistry Absorption or release of heat that accompanies chemical reactions Energy Capacity to supply heat or to do work

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